SBI Credit Card — fraud credit card transaction

Address:

Hyderabad, Telangana, 500081

I'm using the SBI bank Credit card for last 1 years. I received this message on my mobile " Rs.1000 was spent on your Credit Card XX2091 on 9-Aug-18 at DUMMY ME BT ONLINE. Avbl Lmt: Rs.9225.47 and i didn't do any transaction i called SBI bank call center they said 1000Rs is n pipe line they have taken the complaint to block the card. but i am really surprised having such brand name how can they have such a poor online security. this is something they should look seriously.I am not going to pay to bank that amount even if i have to take this bank to consumer court.